class Student:
    name = None

    def say_hi(self):
        print(f"大家好，我是{self.name}，欢迎大家多多关照")

    def say_hello(self, msg):
        print(f"大家好，我是{self.name}, {msg}")


stu = Student()
stu.name = "2333"
stu.say_hi()
stu.say_hello("你好呀")










